By Alek Arend Deebo Samuel and the San Francisco 49ers finally agreed on a new contract extension over the weekend and made it official on Monday. It’s a three-year, $71.6 million extension. Now, new details are starting to emerge about the incentives included in Samuel’s new contract. Let’s just say the Niners’ versatile offensive weapon is going to want to keep getting snaps at running back. Per ESPN’s Adam Schefter, Samuel will receive $650,000 each season he eclipses 380 rushing yards. He’ll earn an additional $150,000 each year he has three or more rushing touchdowns. In short, Samuel can…